|
One way to test the benefit of the draft would be so do the same drive at the same speed...that is, IF you usually drive faster than you were that day. Some of that 11% might have been from the slower speed, if you usually drive faster. Not perfect science, but it is still decent data.
__________________
-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
|